Hey everyone. I constantly am throwing a po134 code DTC P0134: Heated Oxygen Sensor No Activity Detected. My two questions are which one of the two sensors is this and two where can i start to diagnose the problem. My car is running horrible right now and I need to fix it.

 

Well I get the o2 sensor heater circuit no activity code (bank 1) I replaced the sensor and it still pops up, so idk but my car runs fine...and I read somewhere once that the heater circuit just warms up the o2 sensor faster to get readings faster when your car starts....idk if thats true, but sounds like it, and it should say bank 1 or maybe cat after the code to determine where its at...at least on my maxima it said bank 1 or 2 for each side, and then cat for other sensor....maybe that helps

 

i have the same problem.
it is the sensor in headers
my car is running rich
what are your mods?

 

Does anybody else have any issues with the P0134 code?? I fixed my rear 02 for the same "heater circuit low" issue. Once I did that, cleared my code for the P0300, AND fixed my EGR issue, I ran into this brand new code out of nowhere. ALL I want to do is get my car inspected.

 

Anyone?

 

i had that same problem but my issue was that someone before me installed a gauge to the front o2 and cut into the wires. I just fixed the wires and it has been fine

 

Oh ok, thanks for your feedback anyways.